[Bug dyninst/15136] stapdyn doesn't fill registers on 32-bit x86

[Bug dyninst/15136] stapdyn doesn't fill registers on 32-bit x86

[jistone at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15136

Josh Stone <jistone at redhat dot com> changed:

           What    |Removed                     |Added
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             Blocks|                            |14573

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[Bug dyninst/15136] New: stapdyn doesn't fill registers on 32-bit x86

[jistone at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15136

             Bug #: 15136
           Summary: stapdyn doesn't fill registers on 32-bit x86
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dyninst
        AssignedTo: systemtap@sourceware.org
        ReportedBy: jistone@redhat.com
    Classification: Unclassified


On 32-bit x86, Dyninst currently doesn't make any registers available to
instrumentation snippets.  Our code fills what it can (nothing) and writes
zeros for the rest.  Thus, any code in the probe handlers which read registers
will get incorrect data, and probably error out if they try to read and
dereference a pointer.

Our code is dynamic about available registers, so once Dyninst expands its
support, stapdyn should just start working too.  Thus, this bug is just for
tracking purposes, and to remind us to try again later.

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[Bug dyninst/15136] stapdyn doesn't fill registers on 32-bit x86

[cosmin.chenaru at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15136

Cosmin Chenaru <cosmin.chenaru at gmail dot com> changed:

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                 CC|                            |cosmin.chenaru at gmail dot com

--- Comment #1 from Cosmin Chenaru <cosmin.chenaru at gmail dot com> ---
Hi. I realize I am 7 years late, but only now I had to instrument a 32-bit
application using SystemTap and Dyninst. I took a look in the latest code for
Dyninst, inside EmitterIA32::emitCall(), and to my little understanding I see
that there is still no support in passing the registers of the probe in order
for SystemTap to get them through enter_dyninst_uprobe_regs().

So can you please tell me, why can't Dyninst obtain the registers during
runtime on x86, and on x64 there is no such limitation?

Thank you.

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[Bug dyninst/15136] stapdyn doesn't fill registers on 32-bit x86

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15136

Frank Ch. Eigler <fche at redhat dot com> changed:

           What    |Removed                     |Added
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           Assignee|systemtap at sourceware dot org    |scox at redhat dot com
                 CC|                            |fche at redhat dot com

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